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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '52979d45261694fee6b2837687576e59a1d1152fe5f2118119f3bbb8e15e2a0a' 
  AND token = 'USy0lCGBm/51wYSoZImJ3Slc17+AIYff+6Aj775hvw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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