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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6ce32ca8389300c5210615017a00bdc842ccb382d4e8618d19e1059a92ad39f4' 
  AND token = 'nmLBkfqvWIPxzbRvJv1ySrODfztWk/Fg9Cw0/ntfxAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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