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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '17b46c3eaf665fd0e55e2aceefac90d9f87e8f81b13de4c66bf8e2f17129c8fa' 
  AND token = 'nNBYE9ANddXV6WxcQ6+A1pC1tf5pvjWFkdoQFzA0Mxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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