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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '72da786cdef2cab0e04198a8de9763fd3b010106219acaa20234b368fcd96902' 
  AND token = 'ibYYxlmL7GZkDZoqJ2QBm1Kyocm08QT96pqhg0gQ1Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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