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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6e54f0bebc7f7dd03637cfaed462cdfbd70c59de1386ff2d17021522ea9878b0' 
  AND token = 'Q/QJ/IklxMntSmLoLr9b85lPIsyojye4y/1k6JJ6HNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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