Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419d5b88a470c372741a82583b1bbfccdf6e816edf4734e0bd31c685827e6405' 
  AND token = 'MFYjkoHINNZfA07+PT8MPNRDF+98ns5tLX353teQrd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}