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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '197b0ea5c98844d0c80a7e52447a6794e2540fbec626fe50473c2ee127813207' 
  AND token = 'QEYrT6Ns9OXZa3ztuFSI3Pb/bvK8ZbOolVbLs548NK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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