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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'acbd120387660a8204588e55a81d1fc3fabbb28084a0a716bdea7babe8603b7f' 
  AND token = 'IO0w8J6rmVaaTL1rvW7CNxewR/KZcVnpQVf9kKT1s34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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