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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2bb6bcb28ae65eb67cc1dba02632de046d9bac4168ea67821834eac1055bb344' 
  AND token = '04yvk7aly0RC2ZMfObd5peAcTuM7Q0QhgI5mVMgbCGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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