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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e92698597dcaebf104f4c05855a03da927a1c036a964285cf6efcb3113bde404' 
  AND token = 'VrepU2U+oOxHM4S0pMe1h64GYe/WlouGTaGljUp4ERE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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