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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'afcd0d7d4e5f0d47a3aa98d5ddc6760ee39351269dbe598db512aa77a929e76e' 
  AND token = '0mUIkf7O0pRLRA3F+o6FlwDLs78a9Z6+PXw+KjW12CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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