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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd80d1345ed8ae23dedb281d13263d00c7abf8ab8522e5466de2152b0292f5bdc' 
  AND token = '5Rex0n+0eiDpMR7Ej2/FTz1wSwolyKZavn29r281vbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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