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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '329259da48c38e4b43ffaa1a27d30a0a6d46712d1d5dfc8d1ea75f05dc4ae85e' 
  AND token = '7qSg1+EuLvXCv+ebCicjE38f73JDJfKBt7/bHiVRpac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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