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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f7cb86afa40de4e4d198010ae5ea85c288a041644caa43e0cafda48851263077' 
  AND token = 'IlWtn0bXSKZenq7qlS+Tky0SGEvfpSpQFq1R3GuhzYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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