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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fb47c0551341e4e00c7ac91d824462579d7828e1dee3c6758df7e14a4c87dd56' 
  AND token = '90Qni5oZgpM6NsfkI83RO6zMof1oKYhNXs/+5HQDDHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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