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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '33d2ab5e370c189e624a0a579c8c2d717933f406a5c43d30e0998a0699edc61b' 
  AND token = '2K0LQXOD34ANiNYY2pR/KISrX5lnbFCQwaMj8LJDLOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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