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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fb7e67e3c6d3537d0cb27187178f975fee3839fd2aa434f10c3a54bcedf961d5' 
  AND token = 'Tz6MPaanmpaE/6dppBC/RlK61CySrhXHbsgN+bRa5jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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