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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b7553aa115dc8340cffb29c18f70e2d52be764246704bf624f29c4fcfd5baebb' 
  AND token = '+uCSqYsG6dVGhAR6A8qnQrdg6evJsFkhYqd3Fl25eDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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