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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '08918eca8815f649320b293737db7492a8589c352bd3576cb5e5017055306418' 
  AND token = 'k5EPgiRZl0/otSqBc3+4CD9BtADkL4huxDuTjsUPACk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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