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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fc8007a4b24ed2f2015a6ba08c83ef9cd9b149a3e5bc017404a0d15ee5d30616' 
  AND token = 'S3IyRU48BFpuDfE4a2vM/O3iBTKw/SqiCKrpBBMu7aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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