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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd7e2599a1b8aa351617af24a502b43c3911481c8e64dacd2fadc50631d43d2c3' 
  AND token = 'JI5keCQ3Dzdne0U0xC9ozmzhA/AdOEcMWc4iHR+aGgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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