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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'efae23714800b92fe9ff9d006a435fda36ad32d967a39bc8bf3040bda6a4141f' 
  AND token = 'VlXrzhT0TE1Fh3rCCNvhXbMvoEpeBwkidgl7DFzbtaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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