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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7101b1a21429a315f6fd6029df1dda01022a33e20dd15993f218848a9770fbd6' 
  AND token = 'xFrvYfdksIBsGhsdamcWdci5H+nfQ3Mt68nzR5gXB3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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