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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c398076528e9bc2d4c4bc5789de97d87e71260153f08ffcf74497646a54a151a' 
  AND token = 'kkTZoCvLfW3X+42+3H4tWv9kJwjlk7IgPnYb4S4W14M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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