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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc250c3c6c0ef987883641adbaa3396b7914f41a560ab0f8ce4c100b986acf88' 
  AND token = 'wOjO40tXlNV0rW0k/ybS2etSb5YvIelNzgp53Hz1Ivw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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