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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5da175ea1a7f8b205cd74d486dbe71db63387fb4bac1d0e6f4ca6a531f11ead9' 
  AND token = '08tNXTKKXJBhmneJEJgWKIjw+3FWcSMOapy8pa4ujcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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