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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c9ce3a1a0479eab8e204ca78377df6fc87a39fe7b7e40f36e93a1d26bfca29a0' 
  AND token = '4dGyCsi9gBuI+W1UuSpFBhEUsHhZQSQudNBXXJNWZ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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