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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5cdd610b34460e62b51136b0f3858a8ac4eced3212a9a8d34006ad62b928050' 
  AND token = 'LNTbT6WboH7ttpIh8nKAC/WgP91Lg3/zgbuePRCnwB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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