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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fff15a69f90cd0ba9cbb1b3412c404e3e83d3e8d15a7db6a6882d798b4d865ff' 
  AND token = '8gqKS4IQHFmNuuZtYfaL49qkX1cEDnknKhEjEnMMZ48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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