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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '45cfab2b522931ff258f8d21d5e57559dad0064a5f7bc0a60725f955d93f3d48' 
  AND token = 'VOHw3psX8CDCCXd30YWE3x/UwYSm0sLpsXfivQBk2HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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