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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '74a7b4383dd9e3c1e9ab4719b092f0dd7ec2999c6f5db4d7bcb7bb4e9bfb966c' 
  AND token = 'ZsDfjHAWGugwD+fpsOO8PcFv7N9svStjzkG1u4nJ224=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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