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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '83e2bbeba5d0cd22597480a8fc5869c4271da32233952c3c6c7c38947ed5eee9' 
  AND token = 'bfx9X/Co1zX/10IIXu2vhOpHAKpwTwlctzvsYaoAJ3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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