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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '122ab1ad9c8a7c525685eb80740e54ae199ad587741d9293d372c65bad7e175e' 
  AND token = 'ogmiYUPySJ2KQCqh47ua+95oioJMcotM1qQvmCVMpxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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