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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f362c8a325c6bfb0c0edea8b04d2429ee4e388f2362a7ee5fac6aec438e190b5' 
  AND token = 'o/OwZbwBORCdsX5igDQC1sSA0eBR97sXFiY8ByxiQrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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