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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cef16e25048508c0a6df4b85f488f71214b7305c93afafe6c2e281c0b3823130' 
  AND token = 'aey79ATxy2dqUHqDksZlfx7hfW7QellWk4uuld3STNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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