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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c4c9ea7f283f031c73888442d2c2bef0ec4ed393649e0ecf30c2328d6d34bf44' 
  AND token = 'Ob1joeIg16JrwHLgY1cCx+gPnpEyRMCzet0I7thTX54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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