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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e299600d37ea4a366af152a7deab7e0f6182c244418398bc1c4d9ab9d5c5014' 
  AND token = 'WrcNoyatoDuGxhBKGWaKBxV8xi6KB41eIugQBHKzxAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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