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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '079486cac6fe85cea48b9ab2f31a2b3609c283908501a6ef013ab95f46a0ba1d' 
  AND token = 'aFkgwrPFTcecZ4GSDW6N1UKQ1CiU3hjqM7I6i30Bsew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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