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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '95e9e0d59ab2f3891b294322519232bf32e300acccdc8e66813c1e0a6ae5a5d6' 
  AND token = 'wHNnKHdI76ORbnQvutuaLw2deB9GI7q9xL+z8XZjfoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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