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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ce0d5c9d5690abdc3998d70855784e2c685b634cac39ef73f51b5b95f524aeed' 
  AND token = 'r6Rtos5b75Mfv3arNAi0hkoJLgsc62Cw/FJMB5ITn5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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