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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1496f31a1fae001e8638e01dcd36d3e407ceed5e927d8b4ae1ff04083131e412' 
  AND token = 'camm4zBk1+BzCnhDZPGHmroUPzVZSkv6ycq1/BhP3Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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