Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ea0830bf7d3bf1aba140f6f09afa1dfb4c696ee60d0d2fa80d5ba0f72084af' 
  AND token = 'zEdoFSNQlmyZi2hl+GppR2xJV3pnMNJP+2CkeliyzVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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