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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '781fbf8eeb4b8eb4e804c6811cc8b9b6cbefd84438b684a6d79eafe055f84009' 
  AND token = 'Fj4x2SFp2LoeeMfkE95aoGzQ9i/Y7kgoQa8UxYjVB6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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