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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '614b7e3af2be3117b794fbe7d33004001178972da763bc30920e4cec41108e13' 
  AND token = 'pz9ev4Qyj50oPIC1uftiS4bTBacyHteT89Yh2PO1MxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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