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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3d9a79e854912c566aa6c73523b2e774a0357b1c4c155dd9484bdadf50c42116' 
  AND token = 'tPiOcjVs1tga/yjYu18EXN4+v4Xjgob+pCc7+/pXC2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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