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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fb4221190d18db99ab1178981f7434d191148349c859a17c22c60bb25ef1ef8' 
  AND token = 'tnSjvx5jkDPO71U6COKctUYlNHFHUEZv7vSNSUiw/Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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