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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ce31aa309a8e1cfd00a5afc10595ca1c19a9b2c778dfa928cd00d5432bbd97d' 
  AND token = 'cGvUGS1m/YPuKjv1aHZHk29cES2CEaOSefFnlyV84iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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