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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2a26e14ee06a42264c7a6d38f850c4a9315bbfb0c78c47489affb633ecfde238' 
  AND token = 'L7QBp1c3mRMIemlsVAmr2wVlFoLSAeBVeS20pBuNO+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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