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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f5ab1609d9fce8a2bebdf8e79f0e9ff92bc6513941cc6d7352706d1da2145b10' 
  AND token = 'Kv6wGA/mj6PdNzAtxi4M6WNMIX4z7XHiCPb4vc2ksis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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