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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb54f88952c9d77ec2d13f87ac0ce931e54b41080a8067427223917c2919bdbd' 
  AND token = 'DkahcZF7ULd91BNL6qaK3JTKaArZsdi387+aT+FG/NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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