Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fb077bf9172ef96e471be75c7c2c17dbd77525bfa1b35fbaa06274b1a33931' 
  AND token = 'hpSg6AexCaoF+SfCNOpTHIWjCGiNceY+vedZ7Ht6RmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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