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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b99c5ea55dbd8c9ba50ac8914cea22c6304df487b7b81c0ab45f013589a5fbc1' 
  AND token = 'Ao2dw4ASSnBzJK3QwDT7gPozTsFYRZT2gl5VoV/EFaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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