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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea4854a2dc21065fa974c739575d79d0beed4bab04dd0bac0ef0e4f4bde37af7' 
  AND token = '63zFQM81vI9YWnC7RZ8j58rC0rrDHpOqoyaONltWJfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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