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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'dee8077822c0f435df53d349b974fbe0e4f584f39a969d07dbfffd21d2c2ead5' 
  AND token = 'OO5V45r9sLJozWBvT6BfYzlF6spc5w85R7Cty2+KqVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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