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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8bed4943135340fbaa5302a971f27c7277e3c477d1feb5854cd9712aacecfa8b' 
  AND token = 'ZRJ4LZRS41fQX5/unZYjD+fQTrT3PGSVpS+yrJdrPEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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