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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '77f51351086837786192ecf1eb7a85842fa98cce546959e4add5ed5e19342d1e' 
  AND token = '7wGZSdDrRIAhLEBeWfEqRRK71oY0fhz2nqrZ1tH20MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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