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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6c9738ab3feb05e799ee0faf2251bf3025094b5e27d07df1665f3af45061858d' 
  AND token = '5/vsxg22HDl50gJuIhNiO5TkPyv6DSy4mwjP9iK9qso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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