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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0097c915e975ee724a6c7f4387e9d3cd94ab0e3bf5353d02ff702c18dc75aa60' 
  AND token = 'E3PEaneBJxEsfKOBSUg2Ny5tSc+lWbeRCdoteqz95uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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