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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f7a93266278b131f8c7b2a412b7e8e6c2a4bbdbe5289c67acbd6afbf53a2405e' 
  AND token = 'ER6tsFw8WpQUQhT1EMP/nKSq/5jjx//RDqYQMC9a0HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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